Which lake zone would be absent in a very shallow lake?

i really wish i could answer this question for you

the answer is "a.) well–developed vascular system."

explanation:

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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